[Rails51] Pass the following tests.

* CoreTest#test_inspect_class
* ReflectionTest#test_association_primary_key_type
* ReflectionTest#test_integer_columns
* ActiveRecord::Migration::ReferencesStatementsTest#test_add_belongs_to_alias
* ActiveRecord::Migration::ReferencesStatementsTest#test_creates_reference_id_column

Author: metaskills

lib/active_record/connection_adapters/sqlserver/type/big_integer.rb

@@ -4,10 +4,6 @@ module SQLServer
       module Type
         class BigInteger < Integer
 
-          def type
-            :bigint
-          end
-
           def sqlserver_type
             'bigint'.freeze
           end

test/cases/column_test_sqlserver.rb

@@ -36,7 +36,7 @@ def assert_obj_set_and_save(attribute, value)
     it 'bigint(8)' do
       col = column('bigint')
       col.sql_type.must_equal           'bigint(8)'
-      col.type.must_equal               :bigint
+      col.type.must_equal               :integer
       col.null.must_equal               true
       col.default.must_equal            42
       obj.bigint.must_equal             42